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Chapter 7Performance optimisation for the support of TCIS pIn terms of throughput, Figure 7.8 shows the maximum system throughput achieved byeach mechanism. The PRA and RR achieve under ≈38% cc for VoIP traffic(Figure 7.8a) and under 47% of the cc for mixed traffic (Figure 7.8b). This is due tocontinuous contention access. The maximum achievable throughput is produced by theCPG mechanisms, which can be up to 52% and 61% of the channel capacity for VoIPand mixed traffic, respectively.All of the enhanced mechanisms achieve a higher system throughput than the PRAmechanism, lowering collision risk and reducing (or even avoiding) contention accesstransmissions, thereby allocating more bandwidth to the reservation access region.System Throughput (%)565350474441383532292623203 Mbps Upstream9.7 Kbps kbps VoIPBackoff CRAa) Voice TrafficCRRRRPRACPGPGEPRA70 85 100 115 130 145 160 175umber of Active Stations6260585654525048464442403 Mbps UsptreamMixed TrafficBackoff CRAb) Mixed TrafficCPGPG & EPRAPRACRR31 33 35 37 39 41 43 45 47umber of Active StationsRRFigure 7.8 – System throughput vs. No. of active stations for VoIP and mixed traffic.Exponential backoff algorithm with enhanced-reservation-request mechanisms.7-10
Chapter 7Performance optimisation for the support of TCIS pIn Figure 7.9, we can appreciate how the amount of bandwidth wasted by collisions isdecreased considerably by the enhanced-reservation-request mechanisms as the offeredtraffic load becomes more intense. The continuous request mechanisms, (CRR andCPG) were designed to avoid contention access entirely. The RR and PG follow thesame dynamics as the CRR and CPG mechanisms respectively, with the exception thatwhen there are no packets in the buffer, stations fall back to contention access.Bandwidth Consumed by CollidedContention Slots (%)3027242118151296303 Mbps Up.9.7 Kbps kbps VoIPBackoff CRAa) Voice TrafficPRACRR & CPGEPRA70 85 100 115 130 145 160 175umber of Active StationsPGRR876543210CRR & CPGb) Mixed TrafficRREPRAPGPRA3Mbps Up.Mixed TrafficBackoff CRA31 33 35 37 39 41 43 45umber of Active StationsFigure 7.9 – Bandwidth consumed by collisions vs. No. of active stations for VoIP andmixed traffic. Exponential backoff algorithm with enhanced-reservation-requestmechanisms.7-11
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I would like to thank all the peopl
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CHAPTER 6: OPTIMISATIO OF CRA ALGOR
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FIGURE 5.17 - SYSTEM THROUGHPUT VS.
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LIST OF TABLESTABLE 2.1 - NEXT GENE
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Chapter 1Introduction pBecause of h
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Chapter 1Introduction pA first step
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Chapter 1Introduction passumption i
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Chapter 1Introduction ppolynomial b
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Chapter 1Introduction pIn general,
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Chapter 1Introduction pminislots to
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Chapter 1Introduction pThe authors
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Chapter 1Introduction prate access
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Chapter 1Introduction p1.4 Overview
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Chapter 2OVERVIEW OF CURRENT CATVNE
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Chapter 2Overview of current CATV n
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Chapter 3THE DVB/DAVIC PROTOCOL3.1
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Chapter 3The DVB/DAVIC protocol pEu
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Chapter 3The DVB/DAVIC protocol pMA
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Chapter 3The DVB/DAVIC protocol pTh
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Chapter 3The DVB/DAVIC protocol p3.
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Chapter 4Simulation and analytical
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Chapter 5Upstream channel capacity
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Referencesp[17] I. Cidon, and M. Si
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Referencesp[50] N. F. Huang, C. A.
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Referencesp[85] V. Rangel, R. Edwar
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Referencesp[112] K. Sriram, “Meth
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APPEDIX A: GLOSSARYAALABRADSLATMBCB
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Appendix AGlossary pkbpsLANLLCMACMA
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Appendix AGlossary pUSBUWVDSLVoDVoI
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Appendix BProtocol stack and packet
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Appendix BProtocol stack and packet
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APPENDIX C: D VERIFICATION TEST FOR
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Appendix D Verification test p209 2
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Appendix EResults for a 6 Mbps upst
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Appendix FGuide to CD-ROM p IEEE802
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